Centrifugal water pump



May 20, 1930. l. c. JENNINGS CENTRIFUGAL WATER PUMP Filed June 15, 1923 5 Sheets-Sheet l wz m? 6mm M4 May 20, 1930. l. c. JENNINGS CENTRIFUGAL WATER PUMP Filed June 15, 5 Sheets-Sheet 2 attozwug I May 20, 1930. A 1. c. JENNINGS 1,759,313

CENTRIFUGAL WATER PUMP Filed June 15. 1923 s Sheets-Sheet 3 l at ented May 20,1930

v UNITED STATES PATENT" oFiFicE IRVING 0. JENNINGS, or SOUTH NORWALK, CONNECTICUT, AssreNoa TO NASH ENGI- NEERING- COMPANY. or SOUTH INORWALK; CONNECTICUT, A ConroRATIoN or CONNECTiCU'I' V CENTRrrUeAL Application filed June 15,

possible to easily separate the pump and mo tor, making it possible to dispense entirely with supporting bearingsfor the drive shaft in the pump providing for the-escape of any air which may enterthe pump housing and preventing it from entering the intake of the impeller, maintaining the impeller in hydraulic balance and permitting easy access to and removal of the impeller without disconnecting any piping. Theinov-el features will be understood from the following description and claimstaken with the drawing. In the drawing: Fig. 1 includes a side View of the motor 7 and its connection to the pump, the pump and a part of the supporting base being shown in vertical longitudinal section;

- Fig. 2 is a vertical cross section on the line 2-2 of Figure 1; Fig. 3 is a cross section on the line 33 of Figure 2; v j

Fig. 4 is an end View of the device looking from the right in Figure 1; and Fig. 5 is a cross section of the centrifugal. pump on the line 55 ofFig. 4. a In Figure 1 of the drawings there is shown a motor 10 which may be of any known kind but. is preferably an electric motor. It is mounted on a supporting base 11 and is secured in fixed position on that base by bolts 12 and 13 passing through the feet-1 L and 15 integral with the motor frame,the bolts extending through spacing blocks 17 and 18 and entering a fixed part of the supporting base 11; It will be noted thatthe supporting base-11 comprises a bottom wall 19 and marginal walls 20 and 21 projecting upwardly from said bottom wall. These marginal walls are of uniform height throughout most of the length of the supporting base but the side walls 21 extend upwardly to a greater height wa ren PUMP 1923. Serial No. 645,661.

at22 at the end next to the pump. The wall 23 next to the pump is substantially. the same height at is ends as the adjacent portions of walls 21 but its upper edge curves downwardly on the arc of a circle between the points 24 and 25 near its ends, as shown by dotted line 7 6 in Figure 4. The supporting base 11' is adapted to rest on and be secured to some other fixed support and for this purpose it has a downwardly extending portion 26 at one end havinga horizontal flange 27 thereon provided with bolt opening 28. The other end of the base 11 is provided with a downwardly projecting portion 29 but this projecting portion does notextend downward as far as the one at the other end'and is for the purpose of attaching a part of the pump mechanism. The motor 10 has supporting bearings in the casings 30 and 31 for the drive shaft 32 which extends through the motor and projects a .material distance be yond the casing 30 at the end of the motor. The casings 30 and 31 carrying the bearings for the shaft are of course rigidly connected l to the main housing of the motor. The pres ent invention does not reside in the structural features of the motor itself but does include the provision of the projectingend portion of the drive shaft 32 and the means for connecting it to the water pump and the 00- operating means for maintaining the water pump and motor in proper fixed relation.

As will be seen by reference'to Figure 1 a centrifugal pump 33 is detachably secured to the end of the supporting base llclose to the motor 10'and with the axis of its impeller" in line with the axisof the shaft 32 of the motor. 2 The housing of the pump includes two main portions having their parts made integral. One of those portions maybe called for convenience the volute casing since 1t contains the volute passageway and impeller and 7 it also includes all pipe connections, theopening through which the drive shaft enters and an integral downwardly extending base portion for attaching it to the end of the base 11';

in such position as tov support that base when placed on any other supporting surface. As will be: seen by reference to F igure'2the volute casing 3 1- has a radially projecting por tion35 at its lower portion on one side form- ;ing a chamber 36 extending part way around vthe circumference of the volute and having a tubular inlet portion 37 provided with a fiange'38 adapted to be connected to the inlet pipe; One wall of chamber 36 which is ina radial plane has an opening 39 in it at the'margin of the volute casing for the purpose of permitting the incoming water to pass into a i chamber in the otherportion of the pump con stituting its head closure, as will be later explained. An outlet or discharge pipe conneci tion 40 of the usual form is located at the lows er part of the volute casing practically in line with theinlet pipe connection, as shown in Figure 2. The integral head portion 41 embodies thel'endfwall of the pump housing and the adj acent'side wall 42 of the impeller casing spaced apart and forming a' water chamber between them and having a marginal flange43 which fits the outer surface of the volute casing which is in a radial plane; the

'said flange extending throughout the circumference of the head portion. Said flange and v the end closure of the head portion are formed p with a portion extending outwardly at that 7 part of the circumference where the inlet ing 39 from the chamber 36 so that the incom chamber 36 is located on the volute casing, as shown in Figures 3 and 4, and this extension has an opening 44 corresponding to'the opening water may enter the chamber 45 in the 1 head portion. The pump casing has an out- 'wardly projecting portion forming'a passageway 46 around the upper portionof the volute casing (see Fig 1) and this passageway, at

its central top portion has a vent pipe connection for air, and extends radially inward ly on the side of the volute casing next to the motor 10 forming a chamber 49 at the central portion around the opening 48 for the drive shaft; The head portion41 has an upwardly projecting portion 50 with one side in contact with the side of the projection on the volute casing forming passageway 46 and having 1 an opening 51 corresponding to the end of co v but ispreferably separable therefrom. As

the passageway for the escape of air from the head portion. The head portion is detachably connected to the volute casing by studs 52 passing through the flange 43at different points around the circumference and it will be noted that thishead' portion may be easily removed by releasing the. stud connections and thus expose the impeller and interior of the volute casing for cleaning or repairs.

Theshaft for driving the impeller 53 of "shown in Figure 1, it consists of a stub shaft 54" extending through the opening 48 in the pump casing and having the impeller 53 secured to its inner endthe hub portion '55 of tion of the shaft 32 closely fits' shaft is rigidly connectedto the projecting theimpeller being held in place by a shoulder 56 formed by a reduction in diameter of the end of the stub shaft and a screw threaded.

nut '57 on the end of'the shaft, which nut may be turnedto clamp it in position. This stub shaft as shown has a cylindrical socket 58 in 7 its outer end, illustrated in dotted lines in Figure 1, in which the projecting end por- The stub portion of the motor shaft by suitable means such as a screw 59 passing throughitandem gaging the shaft 32. In these cases wherethe projecting portion ofthe shaft is made with a separate stub extension instead of integral,

it is necessary that the connecting joint be tight and rigid so that it will have'practically I the effect of an integral extension so that theshaft will serve as a support for the impeller in the pump housing-and'will'be perfectly i steady. By thus supportingthe impeller by the drive shaft of the motor it is not necessary to provide the pumphousing with any substantial bearing support for it since the ump housing is supported in such'position that the shaft will turnfreely in the opening 48 in its adjacent wall. The outer wall 60 forming the passageway 46 and the chamber 49 around the drive shaft is provided with a cylindrical portion 61 with an inturned end 62 forming a stuffing box around the shaft for packing rings63 and 64. A gland 65 having a flange 66 maybe operated tocom press the packing-by means of studs 67. 7A lantern gland 68 may be used in the packing tends to prevent air from entering the pump housing but if any should leak in it would pass upwardlythrough the passageway 46 to the outlet pipe connection 47 and any air which may be drawn into the pump'through the inlet connection will also riseto the top- 'of the casing and escape through the opening- 51 in the head portion and'the vent pipe connection 47. The passageway 46 and chamber 49 connected with the water chamber in thef head portion 41 serve the additional purpose of maintaining the impeller in hydraulic bal ance, since it provides for equal water pressure on both sides ofthe exposed hub portion of the impeller. The water from the inlet fills the chamber 45, and passing 1 through the opening 51 and passageway 46, fills chamber 49, so that these chambersare' both constantly full of water. 'It will be noted that the hub portion" of the impeller forms Part of tha l f ll :Of the water chamber 49. r a;

The supporting base for thepump which as abovestated isintegral with the volute por5 tion includes a Vertical plate-like portion 73 I which fits the outer face of the wall 23 of the base portioirllancl a horizontal plate-like portion l projecting therefrom at its lower v 7 and connected to the volute by a pipe 69 to 1 water seal the stuffing box (see Fig. 5) This v edge and having thickened-end portions 72, as f shown in Figures 1, 2 and 4. The vertical wall 73 is not quite solong transversely of the base ll as the end wall 23 of that base, aswill be seen by reference to Figure 4. It is integrally connected to the inner sides ofthe inlet pipe connection 37 and outlet pipe connection 40. and with the inner wall of the projecting portion 35 forming chamber 36 and also between those parts on the'lower side. It however has upwardly projecting portions 74, 75 above the inlet and'outlet pipe connections with their inner edges on the arc of a circle spaced a short'distance outwardly from the margin, of thehousing. It will be. noted that theseprojections extend slightly above the upper edge of the end'portions 24iand of the end 23 of the base portion 11, as shown in dotted lines in Figure 4, the curved portion of the end 23 of the base 11 being indi catedby the dottedline 7 6 in Figure 2. The

material of the wall 7 3 is not quite so thick above the dotted line 77 as it'is'below that line. A vertical flange or rib 78 extends upwardly from the central portion of the horizontal plate 71 and is integrally connected 7 with the lower portion of the volute casing. as shown in'Figure 4,, and it extends to the outer margin of plate 71. The wall 7 3 has at its ends thickened or raised portions 79, 80, 81 and 82 provided with bolt holes matching corresponding boltrholes in the end of the base portion 11 whereby the parts may be bolted together. The upwardly projecting portions 7 4 and are also providedwith bolt holes 83 and 84 and bolts 85 pass through them and through the corresponding upper edge portions of the end wall 23. It will be noted by reference to Figure 1 that the bottom surface of the horizontal plate 71 is in the same horizontal plane as the lower edge of the downward projection 29 against which it abuts but that the lower surface of the enlarged portions of plate 71 are in-the same horizontal plane as the lower surface of the downward projection 26' at the other end of the base 11 and thus these enlarged portions serve to support the end of the base which carries the pump when the device as a whole is placed on some other, support. These enlarged end portions 72 furthermore are provided with bolt openings 86, (Figs. 2 and4). A vertical strengthening rib 87 connects the projecting portion of the volute casing which forms the chamber 49 surrounding the shaft, and" the lower horizontal portion 70. at the bination between the motor and pump does not require or include the usual flexible c-ou pling connecting them and thus the troubles usually incident to its use are avoided and the short rigid shaft extension used as-a substitute'for them has the additional advantages of greatly reducing thespaize occupied by the combination and v the number of working parts, and the resulting wear and chance for.

disarrangement, making it possible to move and ship the combination as an. entity connected' and ready for operation, dispensing with the usual supporting-bearingsfor the shaft in the pump housing by supporting and: centering that shaft through the action of the necessarybearings of the motor. In addition to the above noted advantages the structural arrangement is such that the motor and pump may be easily assembled and secured in cooperative relation and maybe easily separated when desired. The detachable head portion4 1'may be easily removed from the main part of the volute casing exposing the impeller by merely withdrawing the-fastening Furthermore the impeller may be removed from the end of its shaft by first taking off nut 5'7 and the impeller with the stub shaft 54 may be withdrawn together when the screw 59 is operated to vdisengagethe projecting portion 32 of the motor shaft;

invention is shown for purposes of illustration, it is not limitedto the details shown beyond what I is indicated in the following claims; r V

Having thus described the invention what is claimed as new and desired to be securedby Letters Patent is: I 4 r 1. A centrifugal water pump comprising in combination a volute casing having inte gral inlet and outlet water pipe connections, an impeller secured to a drive shaft therein, a separate head portion comprising an end wall of the pump housing and the adjacent wall of the impeller casing spaced apart to form a water chamber between them and provided with an inlet port connecting said chamber with said inlet pipe connection of the volute casing and means for detachably connecting said head portion to said volute.

chamber with said inlet pipe connection of the volute casing, means for detachably con v necting said head'portion tosaid volute casing, and a vent pipe connectionat the top of said volute casing in open communication withthe upper end of at least one of said water chambers thus permitting'the escape of air. 1 r o Although one specific embodiment of the" bolts and without disconnecting any pipes.

3'. A centrifugal water pump comprising in combination a volute casing having integral inlet and outletwater pipe connections, an impeller secured to a drivefshaft therein, a

'water'chamber surrounding said shaft, a

separate head portion comprising an end wall of the pump housing and the adjacent wall of the impeller casing spacedapart to form a second water chamber between them and providedywith an inlet port'connectl'ng said chamber with saidinlet pipe connectionof the volute casing and, means for detachably connecting saidhead portion to said volute casing, a vent pipe connection at the top of said volute casing in open communication with theupper endofuat leastone of said water chambers permitting the escape of alr,

- part of the'wall of the first mentioned chamberbeing extended longitudinally to form a stufiing box with packing therein surrounding said shaft. j V

4. A centrifugal water pump comprising in combination a volute casing having integral inlet and outlet water pipe connections an impeller secured to a drive shaft there n, a

water chamber surroundin said shaft,a' separate head portion includ ing an end wall of thepump housing and the adjacent wall of the impeller casingspaced apart fornnng a second water chamber between them and provided with an inlet port connecting sald chamber .withsaid inlet pipe connection of the volute casing and meansfor detachably connecting saidv head casing, the vent pipe connection at the, top of said'volute casing in open communication with the upper endof at least one of sa d water chambers permitting the escape of air,

I part of the wall of the first mentioned chamseal the stuffing box.. 7

her bein extended longitudinally forming a stufling hox withpacking therein surrounding said shaft, a lantern gland between the ends of said packing and a pipe connecting said "land to the volute of the pump g to water "chamber with said inletvp ipe connection of the volute casing and means for detachably con necting said head portion'tosaid volute casing, said inlet'pip'e connection projection outwardly in a radialfdirection from the outer margin of the volute'and including a chamher having an inlet for water and a lateral opening in its radial side facing the head portion and the saidhead portion having a radial projecting portion'jin contact at one'side with portion to said volute said chamber. r

6. A centrifugalwater pump comprising in combination a volute casing having integral inlet and outlet water pipe connections, an impeller secured to-a drive shaft therein, packing for said shaft, an integral projecting portion on said casing forminga passageway across the top of the volute at its highest point having a vent opening over the volute and extending radially inwardly of separate head portion including/an end wall of the pump housing and the adjacent wall of the impeller casing, said walls being each spaced apart forminga second water-chamber between them, said head portion being providedwith inlet ports connecting said second water chamber with said inlet pipe con-' nection and with said passageway across the top of the volute casing and means for detachably connecting said head portion to said volute casing. V 7

' 7 Pumping apparatus of the character de-' scribed including in combination a plate-like base having an open upper side, means for supportlng one end of said base, the other end of said base having a vertical surface, a' 'pump secured against said surface havlng means constituting a support for this end of the base, a motorremovably secured onthe open upper side of said base having a rotary shaft supported in fixed position by hearings in said motor and projecting therefrom for-a that side registering with said opening material distance, and means for securing i the impeller in said pump to said shaft whereby it will-be supported and rotated by said shaft. 5 V

8. Pumping apparatus of the character described including o in combination a base, means for supporting one end of said base, the other end of said base having a vertical surface, a pumpsecured against said surface having means constituting support for this end of the base, a motor detachabl e mounted as a unit on said base having a rotary shaft. supported in fixed position by bearings in said motor and projecting therefrom for a material distance, and means for securing the impeller in said pump to said shaft whereby it will be supported and rotated by said shaft, the projecting portion of said shaft being composed of two aligned sections 7 detachably but rigidly secured together, the outer section entering said pump.

9. Pumping apparatus of the character de scribed, comprising in combination, acentrifngalpumpcomprising a rotor and a housing having a head, saidihousing being provided with pipe connections forinlet and discharge pipes and having an inlet chamber, said head 7 1 I said. inlet connection and having an openinghaving a radial extension at the lower portion having its shaft in alignment with the axis of of the periphery thereof provided withLa port affording communication between sa1d inlet connection and chamber, a base having a vertical end surface adapted to fit against a corresponding surface on said housing, means to secure the housing against saidsurface, and a motor mounted on top of said base the rotor of the pump. 1

10. Apparatus of the character described including in combination, a base having a vertical surface at one end thereof and supporting flanges at the other end,a motor on said base, a centrifugal pump aligned with and driven by said motor and having a vertical surface, and means securing said pump to said base with said surfaces in contact, said pump having a plate like portion with thick- I ened end portions providing the support for the pump end of the base, and inletand outlet pipes entirely free of said base. 7

11. A centrifugal pump comprising in combination a casing having a separable head closure, an impeller, two walls around the hub of said impeller within the casing forming an impeller housing, one of said walls I being integral with said head closure and spaced from the end thereof providing an inlet chamber, a second chamberat the other side of said hub in communication with the inlet chamber outside the periphery of said housing, whereby the pressure on the opposite ends of the impeller hub is balanced.

In testimony whereof I hereunto aflix my signature. IRVING 0. JENNINGS. 

